Dinuclear Coordination Compounds Based on a 5-Nitropicolinic Carboxylate Ligand with Single-Molecule Magnet Behavior

Abstract

Isostructural dinuclear dysprosium and yttrium coordination compounds based on the 5-nitropicolinic carboxylate ligand were synthesized and characterized. The formation of these air-stable complexes is achieved via solvothermal routes employing water as the reaction solvent. The dysprosium-based complex exhibits single-molecule magnet behavior with frequency dependence of the out-of-phase susceptibility at zero direct-current field. High-resolution mass spectrometry (electrospray ionization) experiments and advanced NMR methods including diffusion NMR techniques were applied on the diamagnetic yttrium analogue and established that these species retained their solid-state structure in solution with hydrodynamic radii of 6.5 Å. Full H,C, N,Y, ΔH, ΔC, and ΔN NMR data are given, and through the analysis of the Ramsey equation, the first electronic insights of these derivatives are provided.

Synthesis and structures of fluoride-bridged dysprosium clusters: influence of fluoride ions on magnetic relaxation behaviors

“…A panoply of lanthanide clusters with a variety of core motifs and nucleation numbers have been successfully synthesized with widely used bridging ligands such as carboxylates, [16][17][18] phosphates, 19 sulfonates, 20 nitronylnitroxide radicals, [21][22][23][24] halides, [25][26][27][28][29] etc. 30 It is known that the fluoride ion possesses a smaller ionic radius and larger electronegativity than the N and O atoms.…”

Four Dinuclear and One-Dimensional-Chain Dysprosium and Terbium Complexes Based on 2-Hydroxy-3-methoxybenzoic Acid: Structures, Fluorescence, Single-Molecule-Magnet, and Ab Initio Investigation

“…The energy barrier is higher than those of some dinuclear dysprosium complexes with a Dy 2 (RCOO) 4 motif (Table S5). ,− …”

Potential antiprostatic performance of novel lanthanide-complexes based on 5-nitropicolinic acid

“…In view of this scenario, we have focused on the synthesis of new picolinic-derived complexes with potential antitumoral activity against prostate cancer. In an effort to create a flexible platform for imaging and treatment purposes, lanthanides with known luminescent and/or antitumoral effects have been selected as the metal coordination group [ 25 , 26 ]: starting from the compound based on Dy III [ 27 ], previously reported by our group and complemented by two new isostructural complexes based on Gd III and Tb III (i.e., [Ln 2 (5-npic) 6 (H 2 O) 4 ]·(H 2 O) 2 ; 5-npic = 5-nitropicolinate; Ln = Dy III (1) , Gd III (2) , Tb III (3) ). Their physicochemical characterization was performed using a set of experimental techniques (e.g., Fourier-transform infrared (FTIR), thermogravimetric analysis (TGA), fluorescence and UV–Vis spectroscopies and X-ray diffraction).…”